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inc/Key.h

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+/**
+ * @file      Key.h
+ * @brief     4-bit keyboard connected to PB19-PB16
+ * @details   Lab 5. Digital Piano using a Digital to Analog Converter<br>
+ * For more information see<br> https://docs.google.com/document/d/1DVmHjqsx24FvLp4x8KKyr5UmDeDlBlfeQPsVvKFQF_k/edit<br>
+ * @version   ECE319K Spring 2024
+ * @author    Your names go here
+ * @copyright Lab solution, do not post,
+ * @warning   AS-IS
+ * @date      October 2, 2023
+  <table>
+<caption id="Lab5inputpins">Pins on the 4-bit Keyboard</caption>
+<tr><th>Pin <th>GPIO<th>Hardware
+<tr><td>PB19 <td>input<td>bit 3 (note with highest frequency)
+<tr><td>PB18 <td>input<td>bit 2
+<tr><td>PB17 <td>input<td>bit 1
+<tr><td>PB16 <td>input<td>bit 0 (note with lowest frequency)
+</table>
+
+  ******************************************************************************/
+#ifndef __KEY_H__
+#define __KEY_H__
+
+/**
+ * Initialize 4-bit keyboard
+ *    - Piano key 3 PB19 (note with highest frequency)
+ *    - Piano key 2 PB18
+ *    - Piano key 1 PB17
+ *    - Piano key 0 PB16 (note with lowest frequency)
+ * @param none
+ * @return none
+ * @brief  Initialize keyboard
+ * @note LaunchPad_Init has been called; this program should not reset Port B
+ */
+void Key_Init(void);
+
+/**
+ * Input from piano key inputs on PB19-PB16
+ * @param none
+ * @return 0 to 15 depending on keys
+ * 0x01 is just Key0, 0x02 is just Key1, 0x04 is just Key2, 0x08 is just Key3
+ * */
+uint32_t Key_In(void);
+
+#endif // __KEY_H__